Dental-drill hand-piece



I (No Model.) I

4 V J; H; SIDDALL.

DENTAL DRILL HANDPIEGE.

Pailfiuellted Apr jm/enm 74 6677; r mm e N. PETERS, Phuloljlhogmphvr. Wnsllillglon, n. c.

hand-piece or holder for dental drill. is a top View of the same.

UNITED STATES PATENT OFFICE.

JOHN SIDDALL, OF CANTON, HIO.

DENTAL-DRILL HAND-PIECE.

SPECIFICATION forming part of Letters Patent No. 296,078, dated April 1, 1884.

Application filed July 28, 1883. (No model.)

To all whom it may concern:

Be it known that I, JOHN H. SIDDALL, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Dental Drills, of which the following is a specification, reference being had therein to the accompanying drawings.

Figure 1 is a side view of my improved Fig. 2 Fig. 3 is a horizontal section Through the part which supports the guide-pulleys. Fig. 4 is a top view of a modified form of drill.

A represents the non-rotating barrel or shell within which the drill-stock and drill are supported. The stock or stem of the drill extends somewhat behind the end of the aforesaid shell or barrel A, and the rearwardly-' extending partcarries' a belt-pulley, B, and a heavy wheel, B, which serves as a handwheel, and also as a fly-wheel and counterbalance to keep the implement in a horizontal position when desired. At one end of the barrel or shell A there is a plate, 0, which projects upwardly, and is cast with or secured rigidly to the said barrel. The drill is revolved by means of a belt, E, which passes around the pulley portion B. The belt eX- tends upward and passes over a pulley carried by a spring, and from there runs to the engine, these latter devices not being shown; or, in place of these, any other suitable means of suspension may be employed. In order to guide properly that portion of the belt which is in immediate proximity to the pulley portion B, I employ a two-part holder, the parts of which are separable, when it isdesired to put in place the belt or remove it. As the belt-h Olders have been heretofore constructed, an inferior support was provided, and the means which were intended to hold the belt in place have not efficiently attained that end, and serious disadvantages have resulted from their use. The holder which I provide for the belt firmly holds it inproper position relatively to the pulleys, and prevents its escap therefrom under any circumstances.

H is a plate or block formed integrally with or secured to the plate or bar 0. In the inner face of this block are formed slots or recesses h, one upon each side thereof.

H is the other part of the guide, it having a also recesses or slots h in its inner face corresponding to the recesses h in the opposite block. These recesses may be only large enough to freely allow the belt to pass up or down through them, as shown in Figs. 3 and I 4, or they may be long enough to support antifriction pulleys or rollers G G, the pulleys G being mounted in the block or bar H by means of bearing-screws h h, and the pulleys G. being mounted in the part H by screws h.

-When the two parts of the guide are clamped screws I I are turned up, thereby clamping tightly together the two blocks or bars H H. The armsi i keep the belt in position in such manner as to entirely prevent its escape when the device is in operation. The spring-fastenings which have been heretofore used have been very troublesome in this respect, they permitting the belt to fly oft from the pulley when moving at a high speed.

What I claim is 1. In a hand-piece for chucks or drill-holders for dental engines, "the combination, with the revolving drill provided with a pulley or belt-holder, of a belt-guide formed in two parts, each having jaws arranged oppositely to those on the other, the parts carrying the jaws being separable from each other, and means for clamping them together, substantially as set forth.

2. In a drill-holder for dental engines, the combination of the revolving drill-holder, the pulley B, the stationary pulley-support H, having the pulleys G G, and the pulley-support H, adapted to be withdrawn from and to he forced up against the pulley-holder H, to clamp the belt in placebetween the pulleys, substantially as set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

. JOHN H. SIDDALL. Witnesses:

HENRY FISHER, FRANK E. GAsE. 

